import type { ProductTableGroup, ProductTableRow } from '@/types/product';

export function groupProductRows(rows: ProductTableRow[]): ProductTableGroup[] {
    const groups: ProductTableGroup[] = [];
    const indexByProductId = new Map<number, number>();

    for (const row of rows) {
        const existingIndex = indexByProductId.get(row.product_id);

        if (existingIndex === undefined) {
            indexByProductId.set(row.product_id, groups.length);
            groups.push({
                product_id: row.product_id,
                product_row_number: row.product_row_number,
                product_name: row.product_name,
                categories: row.categories,
                is_active: row.is_active,
                variants: [row],
            });

            continue;
        }

        groups[existingIndex].variants.push(row);
    }

    return groups;
}